s标签显示后台数据的基本用法以及iterator遍历用法

普通属性

java文件赋值并且set和get

private String username;
private String password;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}
public String execute(){
username = "zhangsan";
password = "123";
}

jsp页面中

<s:property value="username"/><br>
<s:property value="password"/><br>

自定义对象

java文件中赋值并且set和get userInfo

public String execute(){
userInfo = new UserInfo();
userInfo.setUsername("hhh");
userInfo.setPassword("111");
}

jsp页面中

<s:property value="userInfo.username"/><br>
<s:property value="userInfo.password"/><br>

List（普通属性）

java文件中赋值并且set和get list

public String execute(){
list = new ArrayList<String>();
list.add("aaa");
list.add("bbb");
list.add("ccc");
}

JSP页面中

<s:iterator value="list" var="var">
<s:property value="var"/><br>
</s:iterator>

或者：

<s:iterator value="list">
<s:property/><br>
</s:iterator>

List（自定义对象属性）

java文件中赋值并且set和get list

public String execute(){
list = new ArrayList<UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
list.add(userInfo);
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
list.add(userInfo);
}

JSP页面中

<s:iterator value="list" var="var">
<s:property value="#var.username"/>
<s:property value="#var.password"/>
<s:property value="#var.roleInfo.rolename"/><br>
</s:iterator>

或者：

<s:iterator value="list">
<s:property value="username"/>
<s:property value="password"/>
<s:property value="roleInfo.rolename"/><br>
</s:iterator>

数组（普通属性）

java文件中赋值并且set和get 数组

public String execute(){
strs = new String[2];
strs[0] = "as";
strs[1] = "asd";
}

JSP页面中

<s:iterator value="strs">
<s:property/><br>
</s:iterator>

或者：

<s:iterator value="strs" var="var">
<s:property value="var"/><br>
</s:iterator>

数组（自定义对象属性）

java文件中赋值并且set和get 数组

public String execute(){
strs = new UserInfo[2];
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u11");
userInfo.setPassword("11");
strs[0] = userInfo;
userInfo = new UserInfo();
userInfo.setUsername("u22");
userInfo.setPassword("22");
strs[1] = userInfo;
}

JSP页面中

<s:iterator value="strs">
<s:property value="username"/>
<s:property value="password"/><br>
</s:iterator>

或者：

<s:iterator value="strs" var="var">
<s:property value="#var.username"/>
<s:property value="#var.password"/><br>
</s:iterator>

Map（普通属性）

java文件中赋值并且set和get map

public String execute(){
map = new HashMap<String,String>();
map.put("k1", "v1");
map.put("k2", "v2");
}

JSP页面中

<s:iterator value="map" var="var">
<s:property value="#var.key"/>
<s:property value="#var.value"/><br>
</s:iterator>

或者：

<s:iterator value="map">
<s:property value="key"/>
<s:property value="value"/><br>
</s:iterator>

Map（自定义对象属性）

java文件中赋值并且set和get map

public String execute(){
map = new HashMap<String,UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
map.put("k1", userInfo);
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
map.put("k2", userInfo);
}

JSP页面中

<s:iterator value="map" var="var">
<s:property value="#var.key"/>
<s:property value="#var.value.username"/>
<s:property value="#var.value.password"/>
<s:property value="#var.value.roleInfo.rolename"/><br>
</s:iterator>

或者

<s:iterator value="map">
<s:property value="key"/>
<s:property value="value.username"/>
<s:property value="value.password"/>
<s:property value="value.roleInfo.rolename"/><br>
</s:iterator>

Map嵌套Map（自定义对象属性）

java文件中赋值并且set和get map

public String execute(){
map = new TreeMap<String,Map<String,UserInfo>>();
Map<String,UserInfo> innerMap = new TreeMap<String,UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
userInfo = new UserInfo();
userInfo.setUsername("u11");
userInfo.setPassword("p11");
userInfo.setRoleInfo(new RoleInfo("r11"));
innerMap.put("k1", userInfo);
innerMap.put("k11", userInfo);
map.put("key1", innerMap);
//////////////////////////
innerMap = new TreeMap<String,UserInfo>();
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
userInfo = new UserInfo();
userInfo.setUsername("u22");
userInfo.setPassword("p22");
userInfo.setRoleInfo(new RoleInfo("r22"));
innerMap.put("k2", userInfo);
innerMap.put("k22", userInfo);
map.put("key2", innerMap);
}

JSP页面中

<s:iterator value="map" var="var">
<s:iterator value="value">
<s:property value="#var.key"/>
<s:property value="key"/>
<s:property value="value.username"/>
<s:property value="value.password"/>
<s:property value="value.roleInfo.rolename"/><br>
</s:iterator>
</s:iterator>

完整例子示例

MapAction.java

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.opensymphony.xwork2.ActionSupport
import com.model.Student
public class MapAction extends ActionSupport
{

private Map<String,String> map;

private Map<String,Student> studentMap;

private Map<String,String[]> arrayMap;

private Map<String,List<Student>> listMap;

public String testMap()
{
map=new HashMap<String,String>();
map.put("1", "one");
map.put("2", "two");

studentMap=new HashMap<String,Student>();
studentMap.put("student1",new Student(new Long(1),"20034140201","张三1","男",25));
studentMap.put("student2",new Student(new Long(2),"20034140202","张三2","女",26));
studentMap.put("student3",new Student(new Long(3),"20034140202","张三3","男",27));

arrayMap=new HashMap<String,String[]>();
arrayMap.put("arr1", new String[]{"1","2003401","leejie","male","20"});
arrayMap.put("arr2", new String[]{"2","2003402","huanglie","male","25"});
arrayMap.put("arr3", new String[]{"3","2003403","lixiaoning","male","21"});

listMap=new HashMap<String,List<Student>>();

List<Student> list1=new ArrayList<Student>();
list1.add(new Student(new Long(1),"20034140201","张三1","男",25));
list1.add(new Student(new Long(2),"20034140202","张三2","男",25));
list1.add(new Student(new Long(3),"20034140203","张三3","男",25));
listMap.put("class1", list1);

List<Student> list2=new ArrayList<Student>();
list2.add(new Student(new Long(1),"20034140301","李四1","男",20));
list2.add(new Student(new Long(2),"20034140302","李四2","男",21));
list2.add(new Student(new Long(3),"20034140303","李四3","男",22));
list2.add(new Student(new Long(4),"20034140304","李四4","男",23));
listMap.put("class2", list2);

return SUCCESS;

}

public Map<String, String> getMap() {
return map;
}

public void setMap(Map<String, String> map) {
this.map = map;
}

public Map<String, Student> getStudentMap() {
return studentMap;
}

public void setStudentMap(Map<String, Student> studentMap) {
this.studentMap = studentMap;
}

public Map<String, String[]> getArrayMap() {
return arrayMap;
}

public void setArrayMap(Map<String, String[]> arrayMap) {
this.arrayMap = arrayMap;
}

public Map<String, List<Student>> getListMap() {
return listMap;
}

public void setListMap(Map<String, List<Student>> listMap) {
this.listMap = listMap;
}

}

testMap.jsp

<%@ page contentType="text/html;charset=UTF-8" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>struts2中的map遍历总结</title>
</head>
<body>
<b>1.map中的value为String字符串</b><br>
<s:iterator value="map" id="column">
<s:property value="#column"/><br>
key: <s:property value="key"/><br>
value:<s:property value="value"/><br>
******************************************<br>
</s:iterator>

<b>2.map中的value为Student对象</b>
<table border="1" width="50%"  cellspacing="0" cellpadding="0">
<tr>
<td>key=value</td>
<td>ID</td>
<td>num</td>
<td>name</td>
<td>sex</td>
<td>age</td>
</tr>
<s:iterator value="studentMap" id="column">
<tr>
<td><s:property value="#column"/></td>
<td><s:property value="value.id"/></td>
<td><s:property value="value.num"/></td>
<td><s:property value="value.name"/></td>
<td><s:property value="value.sex"/></td>
<td><s:property value="value.age"/></td>
</tr>
</s:iterator>
</table>
<p>

<b>3.map中的value为String数组</b>
<table border="1" width="50%" cellspacing="0" cellpadding="0">
<tr>
<td>key=value</td>
<td>ID</td>
<td>num</td>
<td>name</td>
<td>sex</td>
<td>age</td>
</tr>
<s:iterator value="arrayMap" id="column">
<tr>
<td><s:property value="#column"/></td>
<td><s:property value="value[0]"/></td>
<td><s:property value="value[1]"/></td>
<td><s:property value="value[2]"/></td>
<td><s:property value="value[3]"/></td>
<td><s:property value="value[4]"/></td>
</tr>
</s:iterator>
</table>
<p>
<b>4.map中的value为list集合</b>
<table border="1" width="50%"  cellspacing="0" cellpadding="0">
<tr>
<td>class</td>
<td>ID</td>
<td>num</td>
<td>name</td>
<td>sex</td>
<td>age</td>
</tr>

<1.<s:iterator value="listHashMap" id="listid">
<s:iterator value="#listid.value" id="listidsub">
<tr>
<td><s:property value="key"/></td>
<td><s:property value="id"/></td>
<td><s:property value="num"/></td>
<td><s:property value="name"/></td>
<td><s:property value="sex"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</s:iterator>
</table>

</body>
</html>